ceph/src/boost/libs/hana/example/cartesian_product.cpp

   1 // Copyright Louis Dionne 2013-2016
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/cartesian_product.hpp>
   6 #include <boost/hana/equal.hpp>
   7 #include <boost/hana/tuple.hpp>
   8 #include <boost/hana/type.hpp>
   9 namespace hana = boost::hana;
  10
  11
  12 constexpr auto tuples = hana::make_tuple(
  13     hana::make_tuple(1, 2, 3),
  14     hana::make_tuple('a', 'b'),
  15     hana::make_tuple(hana::type_c<int>, hana::type_c<char>)
  16 );
  17
  18 constexpr auto prod = hana::make_tuple(
  19     hana::make_tuple(1, 'a', hana::type_c<int>),
  20     hana::make_tuple(1, 'a', hana::type_c<char>),
  21     hana::make_tuple(1, 'b', hana::type_c<int>),
  22     hana::make_tuple(1, 'b', hana::type_c<char>),
  23
  24     hana::make_tuple(2, 'a', hana::type_c<int>),
  25     hana::make_tuple(2, 'a', hana::type_c<char>),
  26     hana::make_tuple(2, 'b', hana::type_c<int>),
  27     hana::make_tuple(2, 'b', hana::type_c<char>),
  28
  29     hana::make_tuple(3, 'a', hana::type_c<int>),
  30     hana::make_tuple(3, 'a', hana::type_c<char>),
  31     hana::make_tuple(3, 'b', hana::type_c<int>),
  32     hana::make_tuple(3, 'b', hana::type_c<char>)
  33 );
  34
  35 static_assert(hana::cartesian_product(tuples) == prod, "");
  36
  37 int main() { }